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hello, i've downloaded xcom from this site but can't run it. i have downloaded both the windows version and the dos version. the windows version only gives me a black screen and a few background sounds, the dos version works but without sound and the earth rotates too fast making it impossible to play. i guess questions like this have been asked before, it's just that there are a few hundreds of posts and i don't want to start reading them all. can someone help me, please? thanks in advance.